321253421553 has 24 divisors (see below), whose sum is σ = 473018673920. Its totient is φ = 210057494400.

The previous prime is 321253421537. The next prime is 321253421563. The reversal of 321253421553 is 355124352123.

321253421553 is a `hidden beast` number, since 3 + 2 + 12 + 53 + 42 + 1 + 553 = 666.

It is not a de Polignac number, because 321253421553 - 2⁴ = 321253421537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321253421563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1388776 + ... + 1603497.

Almost surely, 2^321253421553 is an apocalyptic number.

It is an amenable number.

321253421553 is a deficient number, since it is larger than the sum of its proper divisors (151765252367).

321253421553 is a wasteful number, since it uses less digits than its factorization.

321253421553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992509 (or 2992506 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

Adding to 321253421553 its reverse (355124352123), we get a palindrome (676377773676).

The spelling of 321253421553 in words is "three hundred twenty-one billion, two hundred fifty-three million, four hundred twenty-one thousand, five hundred fifty-three".